| Michal Simek | 12e8414 | 2009-03-27 14:25:12 +0100 | [diff] [blame^] | 1 | #include <linux/string.h> |
| 2 | #include <linux/kernel.h> |
| 3 | #include <linux/of.h> |
| 4 | #include <linux/init.h> |
| 5 | #include <linux/module.h> |
| 6 | #include <linux/mod_devicetable.h> |
| 7 | #include <linux/slab.h> |
| 8 | #include <linux/of_device.h> |
| 9 | |
| 10 | #include <linux/errno.h> |
| 11 | |
| 12 | void of_device_make_bus_id(struct of_device *dev) |
| 13 | { |
| 14 | static atomic_t bus_no_reg_magic; |
| 15 | struct device_node *node = dev->node; |
| 16 | char *name = dev->dev.bus_id; |
| 17 | const u32 *reg; |
| 18 | u64 addr; |
| 19 | int magic; |
| 20 | |
| 21 | /* |
| 22 | * For MMIO, get the physical address |
| 23 | */ |
| 24 | reg = of_get_property(node, "reg", NULL); |
| 25 | if (reg) { |
| 26 | addr = of_translate_address(node, reg); |
| 27 | if (addr != OF_BAD_ADDR) { |
| 28 | snprintf(name, BUS_ID_SIZE, |
| 29 | "%llx.%s", (unsigned long long)addr, |
| 30 | node->name); |
| 31 | return; |
| 32 | } |
| 33 | } |
| 34 | |
| 35 | /* |
| 36 | * No BusID, use the node name and add a globally incremented |
| 37 | * counter (and pray...) |
| 38 | */ |
| 39 | magic = atomic_add_return(1, &bus_no_reg_magic); |
| 40 | snprintf(name, BUS_ID_SIZE, "%s.%d", node->name, magic - 1); |
| 41 | } |
| 42 | EXPORT_SYMBOL(of_device_make_bus_id); |
| 43 | |
| 44 | struct of_device *of_device_alloc(struct device_node *np, |
| 45 | const char *bus_id, |
| 46 | struct device *parent) |
| 47 | { |
| 48 | struct of_device *dev; |
| 49 | |
| 50 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
| 51 | if (!dev) |
| 52 | return NULL; |
| 53 | |
| 54 | dev->node = of_node_get(np); |
| 55 | dev->dev.dma_mask = &dev->dma_mask; |
| 56 | dev->dev.parent = parent; |
| 57 | dev->dev.release = of_release_dev; |
| 58 | dev->dev.archdata.of_node = np; |
| 59 | |
| 60 | if (bus_id) |
| 61 | strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE); |
| 62 | else |
| 63 | of_device_make_bus_id(dev); |
| 64 | |
| 65 | return dev; |
| 66 | } |
| 67 | EXPORT_SYMBOL(of_device_alloc); |
| 68 | |
| 69 | int of_device_uevent(struct device *dev, struct kobj_uevent_env *env) |
| 70 | { |
| 71 | struct of_device *ofdev; |
| 72 | const char *compat; |
| 73 | int seen = 0, cplen, sl; |
| 74 | |
| 75 | if (!dev) |
| 76 | return -ENODEV; |
| 77 | |
| 78 | ofdev = to_of_device(dev); |
| 79 | |
| 80 | if (add_uevent_var(env, "OF_NAME=%s", ofdev->node->name)) |
| 81 | return -ENOMEM; |
| 82 | |
| 83 | if (add_uevent_var(env, "OF_TYPE=%s", ofdev->node->type)) |
| 84 | return -ENOMEM; |
| 85 | |
| 86 | /* Since the compatible field can contain pretty much anything |
| 87 | * it's not really legal to split it out with commas. We split it |
| 88 | * up using a number of environment variables instead. */ |
| 89 | |
| 90 | compat = of_get_property(ofdev->node, "compatible", &cplen); |
| 91 | while (compat && *compat && cplen > 0) { |
| 92 | if (add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat)) |
| 93 | return -ENOMEM; |
| 94 | |
| 95 | sl = strlen(compat) + 1; |
| 96 | compat += sl; |
| 97 | cplen -= sl; |
| 98 | seen++; |
| 99 | } |
| 100 | |
| 101 | if (add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen)) |
| 102 | return -ENOMEM; |
| 103 | |
| 104 | /* modalias is trickier, we add it in 2 steps */ |
| 105 | if (add_uevent_var(env, "MODALIAS=")) |
| 106 | return -ENOMEM; |
| 107 | sl = of_device_get_modalias(ofdev, &env->buf[env->buflen-1], |
| 108 | sizeof(env->buf) - env->buflen); |
| 109 | if (sl >= (sizeof(env->buf) - env->buflen)) |
| 110 | return -ENOMEM; |
| 111 | env->buflen += sl; |
| 112 | |
| 113 | return 0; |
| 114 | } |
| 115 | EXPORT_SYMBOL(of_device_uevent); |